package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"
	"time"

	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
)

type Task struct {
	ID      string `json:"id"`
	Content string `json:"content"`
	Due     *struct {
		Date string `json:"date"`
	} `json:"due"`
}

var (
	todoistToken  = os.Getenv("TODOIST_TOKEN")
	telegramToken = os.Getenv("TELEGRAM_TOKEN")
	chatID        = os.Getenv("CHAT_ID")
	bot           *tgbotapi.BotAPI
	overdueTasks  = map[string]bool{}
)

func getOverdueTasks() []Task {
	log.Println("[INFO] Запрашиваю задачи из Todoist...")
	req, _ := http.NewRequest("GET", "https://api.todoist.com/rest/v2/tasks", nil)
	req.Header.Set("Authorization", "Bearer "+todoistToken)

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		log.Println("Ошибка запроса Todoist:", err)
		return nil
	}
	defer resp.Body.Close()

	var tasks []Task
	if err := json.NewDecoder(resp.Body).Decode(&tasks); err != nil {
		log.Println("Ошибка парсинга задач:", err)
		return nil
	}

	now := time.Now().Format("2006-01-02T15:04")
	var overdue []Task
	for _, task := range tasks {
		if task.Due != nil && strings.Compare(task.Due.Date, now) < 0 {
			overdue = append(overdue, task)
		}
	}
	return overdue
}

func closeTask(taskID string) {
	url := fmt.Sprintf("https://api.todoist.com/rest/v2/tasks/%s/close", taskID)
	req, _ := http.NewRequest("POST", url, nil)
	req.Header.Set("Authorization", "Bearer "+todoistToken)
	http.DefaultClient.Do(req)
}

func spamCheck() {
	tasks := getOverdueTasks()
	for _, task := range tasks {
		if !overdueTasks[task.ID] {
			msg := tgbotapi.NewMessage(toInt64(chatID), fmt.Sprintf("🔥 Просрочено: %s", task.Content))
			button := tgbotapi.NewInlineKeyboardMarkup(
				tgbotapi.NewInlineKeyboardRow(
					tgbotapi.NewInlineKeyboardButtonData("✅ Сделал", task.ID),
				),
			)
			msg.ReplyMarkup = button
			bot.Send(msg)
			overdueTasks[task.ID] = true
		} else {
			bot.Send(tgbotapi.NewMessage(toInt64(chatID), "⏰ Ну что, сделал уже?!"))
		}
	}
}

func toInt64(s string) int64 {
	var n int64
	fmt.Sscan(s, &n)
	return n
}

func main() {
	var err error
	bot, err = tgbotapi.NewBotAPI(telegramToken)
	if err != nil {
		log.Fatal("Ошибка запуска бота:", err)
	}

	log.Println("[INFO] Бот запущен")

	u := tgbotapi.NewUpdate(0)
	u.Timeout = 60
	updates := bot.GetUpdatesChan(u)

	ticker := time.NewTicker(1 * time.Hour)
	go func() {
		spamCheck()
		for range ticker.C {
			spamCheck()
		}
	}()

	for update := range updates {
		if update.CallbackQuery != nil {
			taskID := update.CallbackQuery.Data
			closeTask(taskID)
			bot.Send(tgbotapi.NewMessage(update.CallbackQuery.Message.Chat.ID, "✅ Задача закрыта!"))
			delete(overdueTasks, taskID)
		}
	}
}